<?php

class Upload
{
    var $saveName;// 保存名
    var $savePath;// 保存路径
    var $fileFormat = array('gif', 'jpg', 'doc', 'application/octet-stream');// 文件格式&MIME限定
    var $overwrite = 0;// 覆盖模式
    var $maxSize = 0;// 文件最大字节
    var $ext;// 文件扩展名
    var $thumb = 0;// 是否生成缩略图
    var $thumbWidth = 130;// 缩略图宽
    var $thumbHeight = 130;// 缩略图高
    var $thumbPrefix = "_thumb_";// 缩略图前缀
    var $errno;// 错误代号
    var $returnArray = array();// 所有文件的返回信息
    var $returninfo = array();// 每个文件返回信息


// 构造函数
// @param $savePath 文件保存路径
// @param $fileFormat 文件格式限制数组
// @param $maxSize 文件最大尺寸
// @param $overwriet 是否覆盖 1 允许覆盖 0 禁止覆盖

    function Upload($savePath, $fileFormat = '', $maxSize = 0, $overwrite = 0)
    {
        $this->setSavepath($savePath);
        $this->setFileformat($fileFormat);
        $this->setMaxsize($maxSize);
        $this->setOverwrite($overwrite);
        $this->setThumb($this->thumb, $this->thumbWidth, $this->thumbHeight);
        $this->errno = 0;
    }

// 上传
// @param $fileInput 网页Form(表单)中input的名称
// @param $changeName 是否更改文件名
    function run($fileInput, $changeName = 1)
    {
        if (isset($_FILES[$fileInput])) {
            $fileArr = $_FILES[$fileInput];
            if (is_array($fileArr['name'])) {//上传同文件域名称多个文件
                for ($i = 0; $i < count($fileArr['name']); $i++) {
                    $ar['tmp_name'] = $fileArr['tmp_name'][$i];
                    $ar['name'] = $fileArr['name'][$i];
                    $ar['type'] = $fileArr['type'][$i];
                    $ar['size'] = $fileArr['size'][$i];
                    $ar['error'] = $fileArr['error'][$i];
                    $this->getExt($ar['name']);//取得扩展名，赋给$this->ext，下次循环会更新
                    $this->setSavename($changeName == 1 ? '' : $ar['name']);//设置保存文件名
                    if ($this->copyfile($ar)) {
                        $this->returnArray[] = $this->returninfo;
                    } else {
                        $this->returninfo['error'] = $this->errmsg();
                        $this->returnArray[] = $this->returninfo;
                    }
                }
                return $this->errno ? false : true;
            } else {//上传单个文件
                $this->getExt($fileArr['name']);//取得扩展名
                $this->setSavename($changeName == 1 ? '' : $fileArr['name']);//设置保存文件名
                if ($this->copyfile($fileArr)) {
                    $this->returnArray[] = $this->returninfo;
                } else {
                    $this->returninfo['error'] = $this->errmsg();
                    $this->returnArray[] = $this->returninfo;
                }
                return $this->errno ? false : true;
            }
            return false;
        } else {
            $this->errno = 10;
            return false;
        }
    }

// 单个文件上传
// @param $fileArray 文件信息数组
    function copyfile($fileArray)
    {
        $this->returninfo = array();
        // 返回信息
        $this->returninfo['name'] = $fileArray['name'];
        $this->returninfo['md5'] = @md5_file($fileArray['tmp_name']);
        $this->returninfo['saveName'] = $this->saveName;
        $this->returninfo['size'] = number_format(($fileArray['size']) / 1024, 0, '.', ' ');//以KB为单位
        $this->returninfo['type'] = $fileArray['type'];
        // 检查文件格式
        if (!$this->validateFormat()) {
            $this->errno = 11;
            return false;
        }
        // 检查目录是否可写
        if (!@is_writable($this->savePath)) {
            $this->errno = 12;
            return false;
        }
        // 如果不允许覆盖，检查文件是否已经存在
        //if($this->overwrite == 0 && @file_exists($this->savePath.$fileArray['name'])){
        //	$this->errno = 13;
        //	return false;
        //}
        // 如果有大小限制，检查文件是否超过限制
        if ($this->maxSize != 0) {
            if ($fileArray["size"] > $this->maxSize) {
                $this->errno = 14;
                return false;
            }
        }
        // 文件上传
        if (!@move_uploaded_file($fileArray["tmp_name"], $this->savePath . $this->saveName)) {
            $this->errno = $fileArray["error"];
            return false;
        } elseif ($this->thumb) {// 创建缩略图
            $CreateFunction = "imagecreatefrom" . ($this->ext == 'jpg' ? 'jpeg' : $this->ext);
            $SaveFunction = "image" . ($this->ext == 'jpg' ? 'jpeg' : $this->ext);
            if (strtolower($CreateFunction) == "imagecreatefromgif"
                && !function_exists("imagecreatefromgif")) {
                $this->errno = 16;
                return false;
            } elseif (strtolower($CreateFunction) == "imagecreatefromjpeg"
                && !function_exists("imagecreatefromjpeg")) {
                $this->errno = 17;
                return false;
            } elseif (!function_exists($CreateFunction)) {
                $this->errno = 18;
                return false;
            }

            $Original = @$CreateFunction($this->savePath . $this->saveName);
            if (!$Original) {
                $this->errno = 19;
                return false;
            }
            $originalHeight = ImageSY($Original);
            $originalWidth = ImageSX($Original);
            $this->returninfo['originalHeight'] = $originalHeight;
            $this->returninfo['originalWidth'] = $originalWidth;
            /*
            if (($originalHeight < $this->thumbHeight
                && $originalWidth < $this->thumbWidth)) {
                // 如果比期望的缩略图小，那只Copy
                move_uploaded_file($this->savePath.$this->saveName,
                    $this->savePath.$this->thumbPrefix.$this->saveName);
            } else {
                if( $originalWidth > $this->thumbWidth ){// 宽 > 设定宽度
                    $thumbWidth = $this->thumbWidth ;
                    $thumbHeight = $this->thumbWidth * ( $originalHeight / $originalWidth );
                    if($thumbHeight > $this->thumbHeight){// 高 > 设定高度
                        $thumbWidth = $this->thumbHeight * ( $thumbWidth / $thumbHeight );
                        $thumbHeight = $this->thumbHeight ;
                    }
                }elseif( $originalHeight > $this->thumbHeight ){// 高 > 设定高度
                    $thumbHeight = $this->thumbHeight ;
                    $thumbWidth = $this->thumbHeight * ( $originalWidth / $originalHeight );
                    if($thumbWidth > $this->thumbWidth){// 宽 > 设定宽度
                        $thumbHeight = $this->thumbWidth * ( $thumbHeight / $thumbWidth );
                        $thumbWidth = $this->thumbWidth ;
                    }
                }
                */
            $radio = max(($originalWidth / $this->thumbWidth), ($originalHeight / $this->thumbHeight));
            $thumbWidth = (int)$originalWidth / $radio;
            $thumbHeight = (int)$originalHeight / $radio;

            if ($thumbWidth == 0) $thumbWidth = 1;
            if ($thumbHeight == 0) $thumbHeight = 1;
            $createdThumb = imagecreatetruecolor($thumbWidth, $thumbHeight);
            if (!$createdThumb) {
                $this->errno = 20;
                return false;
            }
            if (!imagecopyresampled($createdThumb, $Original, 0, 0, 0, 0,
                $thumbWidth, $thumbHeight, $originalWidth, $originalHeight)) {
                $this->errno = 21;
                return false;
            }
            if (!$SaveFunction($createdThumb,
                $this->savePath . $this->thumbPrefix . $this->saveName)) {
                $this->errno = 22;
                return false;
            }

        }
        // 删除临时文件
        /*
        if(!@$this->del($fileArray["tmp_name"])){
            return false;
        }
        */
        return true;
    }

// 文件格式检查,MIME检测
    function validateFormat()
    {
        if (!is_array($this->fileFormat)
            || in_array(strtolower($this->ext), $this->fileFormat)
            || in_array(strtolower($this->returninfo['type']), $this->fileFormat))
            return true;
        else
            return false;
    }
// 获取文件扩展名
// @param $fileName 上传文件的原文件名
    function getExt($fileName)
    {
        $ext = explode(".", $fileName);
        $ext = $ext[count($ext) - 1];
        $this->ext = strtolower($ext);
    }

// 设置上传文件的最大字节限制
// @param $maxSize 文件大小(bytes) 0:表示无限制
    function setMaxsize($maxSize)
    {
        $this->maxSize = $maxSize;
    }
// 设置文件格式限定
// @param $fileFormat 文件格式数组
    function setFileformat($fileFormat)
    {
        if (is_array($fileFormat)) {
            $this->fileFormat = $fileFormat;
        }
    }

// 设置覆盖模式
// @param overwrite 覆盖模式 1:允许覆盖 0:禁止覆盖
    function setOverwrite($overwrite)
    {
        $this->overwrite = $overwrite;
    }


// 设置保存路径
// @param $savePath 文件保存路径：以 "/" 结尾，若没有 "/"，则补上
    function setSavepath($savePath)
    {
        $this->savePath = substr(str_replace("\\", "/", $savePath), -1) == "/"
            ? $savePath : $savePath . "/";
    }

// 设置缩略图
// @param $thumb = 1 产生缩略图 $thumbWidth,$thumbHeight 是缩略图的宽和高
    function setThumb($thumb, $thumbWidth = 0, $thumbHeight = 0)
    {
        $this->thumb = $thumb;
        if ($thumbWidth) $this->thumbWidth = $thumbWidth;
        if ($thumbHeight) $this->thumbHeight = $thumbHeight;
    }

// 设置文件保存名
// @param $saveName 保存名，如果为空，则系统自动生成一个随机的文件名
    function setSavename($saveName)
    {
        if ($saveName == '') {  // 如果未设置文件名，则生成一个随机文件名
            $name = date('YmdHis') . "_" . rand(100, 999) . '.' . $this->ext;
            //判断文件是否存在,不允许重复文件
            if (file_exists($this->savePath . $name)) {
                $name = setSavename($saveName);
            }
        } else {
            $name = $saveName;
        }
        $this->saveName = $name;
    }

// 删除文件
// @param $fileName 所要删除的文件名
    function del($fileName)
    {
        if (!@unlink($fileName)) {
            $this->errno = 15;
            return false;
        }
        return true;
    }

// 返回上传文件的信息
    function getInfo()
    {
        return $this->returnArray;
    }

// 得到错误信息
    function errmsg()
    {
        $uploadClassError = array(
            0 => 'There is no error, the file uploaded with success. ',
            1 => 'The uploaded file exceeds the upload_max_filesize directive in php.ini.',
            2 => 'The uploaded file exceeds the MAX_FILE_SIZE that was specified in the HTML form.',
            3 => 'The uploaded file was only partially uploaded. ',
            4 => 'No file was uploaded. ',
            6 => 'Missing a temporary folder. Introduced in PHP 4.3.10 and PHP 5.0.3. ',
            7 => 'Failed to write file to disk. Introduced in PHP 5.1.0. ',
            10 => 'Input name is not unavailable!',
            11 => 'The uploaded file is Unallowable!',
            12 => 'Directory unwritable!',
            13 => 'File exist already!',
            14 => 'File is too big!',
            15 => 'Delete file unsuccessfully!',
            16 => 'Your version of PHP does not appear to have GIF thumbnailing support.',
            17 => 'Your version of PHP does not appear to have JPEG thumbnailing support.',
            18 => 'Your version of PHP does not appear to have pictures thumbnailing support.',
            19 => 'An error occurred while attempting to copy the source image . 
					Your version of php (' . phpversion() . ') may not have this image type support.',
            20 => 'An error occurred while attempting to create a new image.',
            21 => 'An error occurred while copying the source image to the thumbnail image.',
            22 => 'An error occurred while saving the thumbnail image to the filesystem. 
					Are you sure that PHP has been configured with both read and write access on this folder?',
        );
        if ($this->errno == 0)
            return false;
        else
            return $uploadClassError[$this->errno];
    }
}

?>
